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Hello. A sudden, temporary loss of consciousness is called syncope and has at least several potential causes, including:
There are a number of potential causes of TLoC:
I'm sorry I cannot advise you as to what to do or whether this is dangerous as I know nothing about your husband's medical history and do not have the advantage of examining him. The only way to know for sure is to have him evaluated in person by a doctor. He may need an extensive work up to determine which of the above categories his syncope falls into, and how best to treat him. Hope all works out for the best.